JPS5778211A - Voltage control oscillator - Google Patents
Voltage control oscillatorInfo
- Publication number
- JPS5778211A JPS5778211A JP55153390A JP15339080A JPS5778211A JP S5778211 A JPS5778211 A JP S5778211A JP 55153390 A JP55153390 A JP 55153390A JP 15339080 A JP15339080 A JP 15339080A JP S5778211 A JPS5778211 A JP S5778211A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- comparator
- level
- output
- analogue switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/06—Frequency or rate modulation, i.e. PFM or PRM
Abstract
PURPOSE:To obtain a frequency generating circuit where the frequency adjustment is easy and a frequency inversely proportional to an input DC voltage is generated, by discharging the electric charge of a capacitor by the output of a comparator which inverts the output polarity when the charging voltage of the capacitor exceeds a prescribed voltage. CONSTITUTION:When a capcitor C5 is charged by a current from a constant current source 4 and the charging voltage becomes higher than an input DC voltage Vi from a terminal 1, the output of a comparator 6 is inverted to the H level from the L level. By the H level signal of the comparator 6, an analogue switch 93 is operated through a diode 91, and a monostable multivibrator 7 is triggerred. A short time constant t0 is set to the monostable multivibrator 7, and the H level signal is outputted only in this time t0 to drive a T type FF8 and hold the analogue switch 93 through a diode 92. Charge of the C5 is discharged by the operation of the analogue switch 93, and the output of the comparator 6 is set to the L level, and the analogue switch 93 is opened to charge the C5 again. By repeating this operation, the FF8 is driven by the signal of a frequency inversely proportional to the voltage Vi, and an oscillation signal of 50% duty is outputted from the FF8.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55153390A JPS5778211A (en) | 1980-10-31 | 1980-10-31 | Voltage control oscillator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55153390A JPS5778211A (en) | 1980-10-31 | 1980-10-31 | Voltage control oscillator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5778211A true JPS5778211A (en) | 1982-05-15 |
Family
ID=15561431
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55153390A Pending JPS5778211A (en) | 1980-10-31 | 1980-10-31 | Voltage control oscillator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5778211A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0447210A2 (en) * | 1990-03-13 | 1991-09-18 | Sharp Kabushiki Kaisha | Carrier reset FM modulator and method of frequency modulating video signals |
-
1980
- 1980-10-31 JP JP55153390A patent/JPS5778211A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0447210A2 (en) * | 1990-03-13 | 1991-09-18 | Sharp Kabushiki Kaisha | Carrier reset FM modulator and method of frequency modulating video signals |
US5157359A (en) * | 1990-03-13 | 1992-10-20 | Sharp Kabushiki Kaisha | Carrier reset fm modulator and method of frequency modulating video signals |
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